Relay 12V 40A SPST Normally Open


12v Relay for Auxiliary Output Terminal


Relay 12V 40A SPST Normally Open 

Backwoods uses these SPST relays to interface charge control and inverter 12 volt aux output to battery vent fans and 2 wire generator auto start commands, among other uses. Basic wiring diagram for battery vent fan wiring included.

1/4″ tabs accept standard female quick-disconnects or commonly used four and five pin OEM relay sockets. 18″ nominal 2 conductor leads.


Coil data –

  • Coil nominal voltage:  12VDC
  • Coil resistance: 90ohms ~10%
  • Nominal Current: 133.3mA ~10%
  • Operating voltage: 8.4VDC Max.
  • Release voltage: 1.2VDC Min.
  • Max Coil Voltage: 15.6VDC 130% of Nominal Voltage

Contact Data –

  • Contact Rating: 40A 14VDC Resistive
  • Max Switching Voltage: 75VDC
  • Max. Continuous Current: 60A
  • Max. Inrush Current: 100A

General Data

  • Dimensions: 1″ (H) x 1″ (W) x 1″ (D) (less mounting tab)
  • Model: CMA31-DC12V-A

Additional information

Weight 0.2 lbs


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